Steady-state and equilibrium vortex configurations, transitions, and evolution in a mesoscopic superconducting cylinder

Physics – Condensed Matter – Superconductivity

Scientific paper

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10 pages, 6 figures, 1 table. Submitted to Physical Review B

Scientific paper

10.1103/PhysRevB.69.094521

A numerical scheme to study the mixed states in a mesoscopic type-II superconducting cylinder is described. Steady-state configurations and transient behavior of the magnetic vortices for various values of the applied magnetic field H are presented. Transitions between different multi-vortex states as H is changed is demonstrated by contour plots and jumps in the B vs H plot. Evolving a uniformly-superconducting initial state using the simplest set of relaxation equations shows that the system passes through nearly metastable intermediate configurations, while seeking the final minimum-energy, steady state consistent with the square symmetry of the sample. An efficient scheme to determine the equilibrium vortex configuration in a mesoscopic system at any given applied field, not limited to the symmetry of the system, is devised and demonstrated.

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